Carton with ice retention flaps

ABSTRACT

A carton for enclosing and dispensing articles that can be configured to serve as a cooler for articles enclosed within the carton, such as beverage cans. The carton includes retention panels that are formed from a top wall of the carton and a pair of top end flaps that are detachable from end walls of the carton. The retention panels can be rotated to be coplanar with a respective side wall and the top end flaps can be elevated with respect to the end walls such that the retention panels and the top end flaps form a retaining structure.

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application No. 60/714,430, filed Sep. 6, 2005, the entirety of which is incorporated herein by reference.

TECHNICAL FIELD

This invention relates to cartons, and more particularly to a carton for multiple articles having a dispenser.

BACKGROUND

Consumers often purchase beverages in disposable cartons to facilitate transporting and dispensing the beverages in various locations, such as parks and campgrounds. It is most convenient for the user to have the ability to dispose of the primary and secondary packaging when the beverages have been consumed, to avoid the need to transport empty containers back home. However, to keep the beverages cold pending consumption, the consumer must typically bring a separate cooler to ice the beverages down. Regardless of whether such coolers are disposable (e.g., STYROFOAM) or reusable, they create an extra expense and inconveniently must be discarded or transported home. Cartons have been developed that serve as containers, carriers, and coolers, but such cartons are typically expensive to manufacture because superfluous sheet material is required to accommodate the ice, and linings are needed to prevent leakage as the ice melts.

Therefore, a heretofore unaddressed need exists in the industry to address the aforementioned deficiencies and inadequacies. What is needed is a carton that is inexpensive to manufacture and that can be configured to serve as a leak resistant cooler for containing ice in order to keep the articles contained within the carton cold.

SUMMARY OF THE INVENTION

The various embodiments of the present invention overcome the shortcomings of the prior art by providing a carton or other container that can be configured to enclose articles, such as beverage cans, and then to be opened and reconfigured to form a retaining structure for retaining additional material, such as ice, above or around the articles that are enclosed within the carton. The leak resistant carton is advantageously manufactured as a unitary structure, without requiring substantial expenditures for additional sheet material.

Generally described, the retaining structure is formed from a wall of the carton which is divisible into retaining panels hingedly connected to opposing vertically disposed walls of the carton so as to be foldably raised into an upright position along the hinged connections, as well as from end flaps or panels that are slidable with respect to other opposed and vertically disposed walls of the carton. Together, the retaining panels and the slidable end flaps approximate a chimney-like structure that effectively extends the height of the peripheral walls of the carton so that additional material can be poured or otherwise placed on top of the articles.

In the exemplary embodiments, the retaining structure is formed from the top wall of a carton. In this respect, the phrase “top wall” simply refers to the wall that faces substantially upward when the carton is opened and the retaining structure is loaded with additional material, and does not limit the carton to any particular orientation when the carton is used in any other manner, such as during carrying or storage. The side and end edges of the top wall are hingedly connected to the peripheral walls of the carton, which typically include a pair of opposed side walls and a pair of opposed end walls, all interconnected to wrap around a group of articles that rest on a bottom wall that is also hingedly connected to the peripheral walls. The bottom wall generally opposes the top wall, although it is contemplated that the top wall may be vaulted, slanted, curved, gabled, or otherwise contoured. The top wall is divisible preferably by means of a first severable seam extending from one end of the top wall to an opposite end, and by additional second and third severable seams extending along the hinged connection between the top wall and the end walls. The first seam, which in the exemplary embodiments is formed from parallel severance lines to approximate a tear strip, is broken to define the centermost edges of a pair of retaining panels. The exemplary second and third seams, each formed from a severance line extending along the hinged connection, are broken to define the end edges of the retaining panels as well as the uppermost edges of a pair of slidable end flaps.

Each end wall is a composite structure that includes a bottom end flap that is fixedly connected to the bottom and side walls of the carton and a top end flap. It is this top end flap that is slidable with respect to the bottom end flap, which remains fixedly connected as the remnant of the end wall after the carton is opened and the retaining structure is formed. Breaking the second, and third seams frees each of the slidable top end flaps from connection to the remainder of the carton except for a pair of connecting strips that foldably connects each slidable top end flap to an end of each of the side walls and optionally to the retention panels. These connecting strips facilitate a telescoping sliding motion upward of the slidable top end flap with respect to the fixed bottom end flap, in which the top end flap moves from a face contacting arrangement toward a coplanar, edge to edge arrangement with respect to the bottom end flap. In this configuration, the free downward extending edge of the slidable top end flap is moved into closer proximity to, but may continue to partially overlap, the distal upward extending edge of the bottom end flap.

As mentioned above, to form the retention structure, the top wall is opened to liberate or to create opposing retention panels. These retention panels form opposite sides of the chimney-like retaining structure. The periphery of the retaining structure is completed by raising the slidable top end flaps to form opposing ends of the retaining structure. The connecting strips support the slidable top end flaps in the upright position. However, according to another aspect of certain embodiments, further support may be provided by a locking tab that is defined by an arcuate or otherwise suitably contoured severance line formed in each top end flap, which locking tab comes into registry with a notch formed in the corresponding bottom end flap. The locking tab is matingly received in the notch to further reinforce the desired position of the slidable top end flap.

With the retention flaps and top end flaps raised, a material such as ice can be poured on top of the articles still within the carton, and can be heaped up above the level of the uppermost ends of the articles, and retained by the retaining structure. As the ice melts, web panels that join the bottom end flaps to adjacent side end flaps prevent the liquid from leaking from the bottom corners of the carton. A convenient, disposable, and inexpensive cooler is thereby achieved, the cooler having leak resistant bottom corners.

It is contemplated that the carton can be usable in a variety of other applications as well, including where the initial contents of the carton are frozen and the material disposed on top heats the contents to form a liquid or slushy consistency that is retained by the walls of the carton.

The foregoing has broadly outlined some of the aspects and features of the present invention, which should be construed to be merely illustrative of various potential applications of the invention. Other beneficial results can be obtained by applying the disclosed information in a different manner or by combining various aspects of the disclosed embodiments. Accordingly, other aspects and a more comprehensive understanding of the invention may be obtained by referring to the detailed description of the exemplary embodiments taken in conjunction with the accompanying drawings, in addition to the scope of the invention defined by the claims.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view of an exemplary embodiment of a blank for forming a carton, according to the present invention.

FIG. 2 is a perspective view of an exemplary embodiment of a carton formed from the blank of FIG. 1.

FIGS. 3 and 4 are partial perspective views of the carton of FIG. 2 showing certain steps of an exemplary method of forming an end wall.

FIGS. 5 and 6 are perspective views of the carton of FIG. 2 showing certain steps in an exemplary method of opening a dispenser.

FIG. 7 is a perspective view of the carton of FIG. 2, in an open condition with the retaining structure erected.

FIGS. 8 and 9 are partial perspective views of the interior of an end wall of the carton of FIG. 2, illustrating the process of slidingly raising one of the top end flaps.

DETAILED DESCRIPTION

As required, detailed embodiments of the present invention are disclosed herein. It must be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms, and combinations thereof. As used herein, the word “exemplary” is used expansively to refer to embodiments that serve as illustrations, specimens, models, or patterns. The figures are not necessarily to scale and some features may be exaggerated or minimized to show details of particular components. In other instances, well-known components, systems, materials, or methods have not been described in detail in order to avoid obscuring the present invention. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.

Referring now to the drawings in which like numerals indicate like elements throughout the several views, the drawings illustrate certain of the various aspects of exemplary embodiments of a carton for enclosing and dispensing articles. The carton can be reconfigured to serve as a cooler for articles enclosed within the carton, such as beverage cans. Specifically, the carton includes panels that can be raised to extend the height of the walls of the carton after it is opened, so that ice or other material can be retained above and around the articles.

FIG. 1 shows a blank 100 that can be folded and secured to form an exemplary carton 200 (shown in FIG. 2). In the illustrated embodiment, a unitary blank is used to form a single carton, although it should be recognized that two or more blanks may be employed, for example, to provide a carton with a dispenser, as described in further detail below. The blank 100 includes a number of primary panels that are aligned along the longitudinal axis of the blank 100 and are hingedly connected one to the next along transverse fold lines, which are substantially perpendicular to the longitudinal axis of the blank 100. Specifically, a bottom panel 102 is hingedly connected to a side panel 106 along a fold line 104, and the side panel 106 is hingedly connected to a top panel 110 along a fold line 108. Additionally, the top panel 110 is hingedly connected to a handle panel 114 along a fold line 112 and the bottom panel 102 is hingedly connected to a second side panel 116 along a fold line 118. Handle panel 114 is so named because an optional handle aperture H is disposed therein to create a means for carrying the carton 200. In alternative embodiments, the handle H is omitted or disposed in another panel.

End flaps are hingedly connected to opposite ends of each primary panel along fold lines that are substantially parallel to the longitudinal axis of the blank 100. The end flaps at opposite ends of each primary panel are substantially identical and therefore like references have been used, with “a” or “b” affixed to distinguish one end of the carton 200 from the other. As will be described below, a first end closure structure is formed from end flaps that are hingedly connected to what is shown in FIG. 1 as the upper end edges of the primary panels. Specifically, a bottom end flap 120 a is hingedly connected to the upper end edge of the bottom panel 102 along a fold line 122 a, a top end flap 128 a is hingedly connected to the upper end edge of the top panel 110 along fold lines 130 a and along a foldable severance line S, and side end flaps 124 a, 132 a, 136 a are hingedly connected to panels 106, 114, 116 along respective fold lines 126 a, 134 a, 138 a. It should be noted that the foldable severance line S extends between the fold lines 130 a.

Similarly, end flaps are hingedly connected to what is shown in FIG. 1 as the lower end edges of the primary panels. Again, it should be understood that end flaps and other elements that have like references with “a” or “b” affixed are substantially identical such that a description of an element with “a” affixed sufficiently describes the like reference with “b” affixed. Thus, for clarity, a description of one of the like elements with an “a” or “b” affixed may sufficiently describe all of the like elements unless a description of each element is necessary for understanding the invention.

Web panels 140 a, 142 a connect the bottom end flap 120 a to the adjacent side end flaps 124 a, 136 a such that the erected carton 200 can hold at least a certain amount of liquid, as described in further detail below. Specifically, web panel 140 a is hingedly connected to side end flap 136 a along fold line 144 a, and is hingedly connected to bottom end flap 120 a along fold line 146 a. Similarly, web panel 142 a is hingedly connected to bottom end flap 120 a along fold line 148 a, and is hingedly connected to side end flap 124 a along fold line 150 a. In the embodiment shown, the web panels 140 a, 142 a are triangular, although any suitable shape may be utilized, with additional fold lines subdividing each of the web panels as needed.

The blank 100 further includes connecting strips 152 a, 154 a that facilitate a telescoping end wall feature, which will be described in more detail below. As will be described in detail below, the connecting strips 152 a, 154 a function to connect the top end flap 128 a to the side panel 106 and to the handle panel 114, respectively. Each connecting strip 152 a, 154 a is formed in part from top end flap 128 a and in part from top panel 110. More specifically, connecting strip 152 a is defined by a fold line 162 a in the top end flap 128 a that is offset from the fold line 130 a, a portion of a side edge 156 a of top end flap 128 a that extends between the outermost ends of fold lines 130 a, 162 a, a severance line 158 a that is offset from the side edge 156 a and extends between the innermost end of fold line 130 a and the innermost end of fold line 162 a, a segment of the fold line 108, and a severance line 160 a that extends diagonally from the intersection of fold line 130 a and severance 158 a to or toward fold line 108. Connecting strip 154 a is similarly defined by side edge 164 a, severance lines 166 a, 168 a, and fold lines 112, 170 a.

Each connecting strip 152 a, 154 a may include a number of fold lines Fi, Fd that facilitate forming a support structure or a gusset style arrangement to maintain the top end flap 128 a in an elevated position and facilitate a sliding or telescoping feature of the top end flap 128 a, as described in further detail below. In the exemplary embodiment, an intermediate fold line Fi is disposed between and parallel to fold lines 130 a, 162 a. Further, diagonal fold lines Fd extend between each of the fold lines 162 a, 130 a and the intermediate fold line Fd. In the exemplary embodiment, the diagonal fold lines Fd are substantially parallel to the severance line 160 a. The pattern of fold lines Fi, Fd that is disposed on each of the other connecting strips is substantially similar.

As used herein, the phrase “frangible line” or “severance line” includes, but is not limited to, perforations, a line of perforations, a printed “cut here” line, a line of short slits, a line of half cuts, a single half cut, any combination of perforations, slits, and half cuts, short score lines, or the equivalent.

The top and bottom end flaps 128 a, 120 a include features that are secured together to detachably connect the top and bottom end flaps 128 a, 120 a when an end closure structure is formed, as described in further detail below. A severance line 172 a is disposed in the top end flap 128 a near severance line S and is shaped to define a yieldable pull tab 182 a. A severance line 174 a is formed near an outer edge 176 a of bottom end flap 120 a and is shaped to define a severable reinforcing tab 184 a. The placement of the severance lines 172 a, 174 a is selected to bring the pull tab 182 a and the reinforcing tab 184 a into registry when an end closure structure of the carton 200 is formed.

A tear strip T is substantially centered on the top panel 110 and extends across the top panel 110 between the top end flap 128 a and the top end flap 128 b. The tear strip T is defined by two substantially parallel severance lines 178, 180. In certain embodiments, a pull tab (not shown) may be disposed at one end of the tear strip T as a means for tear initiation. In other embodiments, one or both ends of the tear strip may be defined by a segment of the severance line S that extends between the severance lines 178, 180. In addition, in certain embodiments the severance lines 160 a, 168 a, and the severance line S extending therebetween, form a substantially continuous severance line that extends between the fold lines 108, 112. In other embodiments, the otherwise continuous severance line may be interrupted by one or more frangible connections between the adjacent sections of the blank. The tear strip T and the severance lines S, 160 a, 168 a define separable portions of the top panel 110, as described in further detail below. It should be understood that, in alternative embodiments, the tear strip T may be replaced by a single severance line, a cut line, or any other suitable means for controllably separating portions of the top panel 110 along an edge.

It is envisaged that, in any embodiment of the present invention, the carton can be formed from a blank by a series of sequential folding and gluing operations, which can be performed by a straight-line automatic packaging machine so that the carton is not required to be rotated or inverted to complete its construction. It is also envisaged that the series of sequential folding and gluing operations can be manually performed. The folding process is not limited to that described below and can be altered according to particular manufacturing or user requirements.

According to an exemplary method, the carton 200 can be partially constructed and preglued or otherwise secured as a tubular structure which may be collapsed for shipping or for loading into an automatic packaging machine. To do so, the side panel 116 is folded inwardly along fold line 118 such that the inside surface of the side panel 116 is in a face contacting arrangement with the inside surface of bottom panel 102. Glue, or other means for securing sheet material, is applied to the outside surface of the side panel 116 and to the outside surface of each of the side end flaps 136 a, 136 b such that, as the blank 100 is folded inwardly along fold line 108, the inside surface of handle panel 114 is brought into an at least partially overlapping face contacting arrangement with the outside surface of the side panel 116. Thereby, the side panel 116 and the handle panel 114 are secured to one another to form a composite side panel 114/116. Additionally, the inside surfaces of side end flaps 132 a, 132 b are also brought into an at least partially overlapping face contacting arrangement with the outside surfaces of side end flaps 136 a, 136 b, thereby forming composite side end flaps 132 a/136 a, 132 b/136 b. The sheet material of the blank 100 can be secured together by any known or yet to be developed means for securing sheet material including, but not limited to, glue or other adhesives, staples, tape, mechanical fasteners, Velcro®, and the like.

The partially erected carton 200 is now in a flattened tubular configuration suitable for storage, shipping, and loading either manually or by means of an automatic packaging machine (not shown). To erect the flattened carton into a tubular structure having walls defined by the primary panels, the primary panels are pulled apart. Accordingly, referring to FIGS. 1 and 2, the bottom panel 102 defines bottom wall 202, side panel 106 defines side wall 206, top panel 110 defines top wall 210, and composite side panel 114/116 defines side wall 214.

As best shown in FIGS. 6 and 7, the articles B are arranged in the carton 200 in a matrix formation with sides thereof substantially parallel to the side walls 206, 214 and opposite ends thereof substantially adjacent to the top and bottom walls 210, 202. The matrix consists of several rows and columns of articles B. The first, or endmost, article B in each row is a member of a first column of articles, the second article B in each row is a member of a second column, and so on.

After the articles are grouped and loaded through either or both of the open ends of the carton 200 as it is arranged as a tubular structure, the end flaps are folded and secured together to form end closure structures at each open end of tubular structure and thereby define the end walls 204, 208. For clarity, the formation of only one of the end closure structures is described.

Referring to FIG. 3, to form the composite end wall 208 (shown in FIG. 5), the top end flap 128 b is folded downward toward the interior of the carton 200 and adhesive or other means for securing is then applied to the outside surface of pull tab 182 b. To ensure the ability of the innermost portion of the end wall 208, top end flap 128 b, to move freely with respect to bottom end flap 120 b and the side end flaps 124 b, 132 b/136 b, no adhesive is applied to the remainder of top end flap 128 b. Referring to FIG. 4, the side end flaps 124 b, 132 b/136 b are folded inwardly and adhesive is applied to the outside surfaces thereof. As the side end flaps 124 b, 132 b/136 b are folded inwardly, the web panels 140 b, 142 b that connect the side end flaps 124 b, 132 b/136 b to the bottom end flap 120 b cause the bottom end flap 120 b to be folded upward or inward so as to be at an angle with respect to the bottom wall 202. The bottom end flap 120 b is then folded fully upward such that the inside surface of the bottom end flap 120 b overlies the outside surface of the top end flap 128 b and the outside surfaces of the side end flaps 124 b, 132 b/136 b. Thereby, the bottom end flap 120 b is secured to the side end flaps 124 b, 132 b/136 b and the inside surface of reinforcing tab 184 b is secured to the outside surface of pull tab 182 b to define a composite tab 182 b/184 b to complete the end closure structure that defines end wall 208. The end closure structure that defines end wall 204 is formed in a similar fashion.

It should be noted that the web panels 140 a, 142 a provide that the corners of the carton adjacent the bottom wall 202 of the carton are continuous or seamless such that the carton can retain a certain level of liquid. In other words, liquid is not allowed to escape between an end wall 204, 208 and an adjacent side wall 206, 214 at or near the bottom wall 202 of the carton 200.

An exemplary method for opening the carton and forming the retaining structure R of the carton 200 is now described. With reference to FIG. 5, a user engages an end of the tear strip T and tears the tear strip T away from the carton 200 along a first seam formed by severance lines 178, 180, thereby dividing the top wall 210 and defining the centermost or distal edges of the retention panels 602, 604, as shown in FIG. 6. The retention panels 602, 604 are further separated from the top wall 210 along second and third seams as the centermost edge of each of the retention panels 602, 604 is pulled outwardly so as to separate its end edges from the adjacent end walls 204, 208, and more specifically from the adjacent top end flap 128 a, 128 b, along segments of the severance lines S and along severance lines 160 a, 160 b, 168 a, 168 b to partially detach the respective retention panel 602, 604. The retention panels 602, 604 then can be folded outwardly along respective fold lines 108, 112 to a generally upright position (shown in FIG. 7). For example, the exemplary retention panels 602, 604 are substantially coplanar with a respective side wall 214, 206, although it is contemplated that the retention panels 602, 604 may bow outward or lean inwardly somewhat with respect to the respective side wall 214, 206.

The retaining structure R is further erected by pulling the top end flaps 128 a, 128 b such that they telescope upward with respect to the respective end wall 202, 208. To do so, composite tab 182 b/184 b is pressed inward (or outward) to break severance lines 174 b and 172 b, which are in registry. By doing so, reinforcing tab 184 b, which is secured to pull tab 182 b, is completely detached from bottom end flap 120 b and pull tab 182 b is partially detached from top end flap 128 b. Then the pull tab 182 b is pulled upward to break the severance lines 158 b, 166 b while urging the top end flap 128 b to slidingly telescope upward with respect to the end wall 208 (shown in FIGS. 8 and 9). In certain alternative embodiments, the severance lines 158 b, 166 b are replaced by cut lines.

Referring to FIGS. 8 and 9, the top end flap 128 b can be easily pulled upward so as to slidingly telescope with respect to the end wall 208 at least in part because the top end flap 128 b is now only attached to the side walls 206, 214 by the connecting strips 152 b, 154 b. Once it reaches the elevated position shown in FIGS. 7 and 9, the top end flap 128 b is retained in the elevated position by the connecting strips 152 b, 154 b, as the connecting strips 152 b, 154 b are folded to form a structure that is able to support the top end flap 128 b. It should be understood that the top end flap 128 a can be pulled upward to an elevated position in a similar manner. In certain embodiments, the carton 200 may include additional features to retain the top end flaps 128 a, 128 b in elevated positions, as described in further detail below.

For example, in the embodiment shown, a locking tab 185 a, 185 b is defined by a severance line 190 a, 190 b (shown in FIG. 1) in each of the top end flaps 128 a, 128 b. The locking tab 185 a, 185 b is an example of a locking means for retaining the top end flap 128 a, 128 b in the elevated or raised position described above. The locking feature fixes the amount of extension of the top end flap 128 a, 128 b above the respective end wall 204, 206 and the angle of deflection of the top end flap 128 a, 128 b with respect to the respective end wall 204, 208, thereby preventing the top end flaps 128 a, 128 b from failing by sinking back down into the carton 200 or by deflecting severely so as to allow the ice to tumble out. To use the locking feature, the severance line 190 a, 190 b is broken, and the locking tab 185 a, 185 b is pushed through the notch 195 a (not shown), 195 b (shown in FIG. 7) formed in and integral to the upper edge 176 a, 176 b of respective bottom end flap 120 a, 120 b after the reinforcing tab 184 a, 184 b is detached—thereby fixing the elevated position of the top end flap 128 a, 128 b in the raised position. Specifically, the inside surface of the locking tab 185 b is substantially in flat face contact with and locked against the outside surface of the end wall 208. As an added benefit, the raised retention panels 602, 604 are less likely to deflect due to the natural tendency of the side walls 206, 214 to bow outward somewhat when the carton is loaded.

As another example, the retention panels 602, 604 and the top end flaps 128 a, 128 b can be interlocked to fortify the retaining structure R. It is contemplated that the side edges of each of these panels may be contoured to form complementary tabs and notches that matingly interlock to fix the position of each flap 602, 604, 128 a, 128 relative to its neighboring flaps.

With retention panels 602, 604 and the top end flaps 128 a, 128 b disposed in a generally upright condition or otherwise extending to form a chimney-like retaining structure, the carton 200 can function as a disposable cooler, ice bucket, or ice pail in that the carton 200 is configured to receive, for example, ice or a similar coolant, which may be poured over the articles B. The retention panels 602, 604 and the top end flaps 128 a, 128 b function as retaining walls to keep the ice in the container or to otherwise increase the volumetric capacity of the carton 200. As previously described, as the ice melts, the web panels 140 a, 140 b, 142 a, 142 b disposed at the bottom four corners of the carton 200 create a barrier to prevent the water from flowing out through the corners. Further, in certain embodiments, the carton includes other means that increase the ability of the carton to withstand water soaking through the walls of the carton or that otherwise includes features that preserve the structural integrity of the walls. For example, inside surface of the blank for forming the carton may be treated with a water resistant coating. In other embodiments, the carton may include a film or liner for at least the interior of the carton. A film or liner can also provide or enhance the water retaining functionality that is described above with respect to the web panels.

The above-described embodiments are merely exemplary illustrations of implementations set forth for a clear understanding of the principles of the invention. Variations, modifications, and combinations may be made to the above-described embodiments without departing from the scope of the claims. For example, as used herein, directional references such as “top”, “base”, “bottom”, “end”, “side”, “inner”, “outer”, “upper”, “middle”, “lower”, “front” and “rear” do not limit the respective walls of the carton to such orientation, but merely serve to distinguish these walls from one another. Any reference to hinged connection should not be construed as necessarily referring to a junction including a single hinge only; indeed, it is envisaged that hinged connection can be formed from one or more potentially disparate means for hingedly connecting materials.

Those skilled in the art will also appreciate that the carton described represents only one example of the various sizes, shapes, types and carton configurations that will be suitable for implementation of the various embodiments of the invention, which is primarily directed to the end wall structure and opening feature that yields retaining walls for holding ice in contact with the articles within the carton.

All such variations, modifications, and combinations are included herein by the scope of this disclosure and the following claims. 

1. A container configured for enclosing articles and reconfigurable to expand a volumetric capacity of the container, comprising: a composite end wall formed at least in part from an inner end flap, wherein said inner end flap is detachable at least partially from said container such that said inner end flap is able to translate to an elevated position with respect to said composite end wall to at least partially define a retaining structure for expanding the volumetric capacity of the container.
 2. The container of claim 1, further comprising means for slidably connecting said inner end flap to the container.
 3. The container of claim 2, wherein: said container comprises an adjacent wall to which said composite end wall is hingedly connected; and said slidably connecting means comprises at least one connecting strip having first and second opposed ends, said first end being hingedly connected to said composite end wall, and said second end being hingedly connected to said adjacent wall.
 4. The container of claim 3, wherein said connecting strip is foldable to form a support structure for maintaining said inner end flap in said elevated position.
 5. The container of claim 2, wherein said inner end flap comprises a locking tab for engaging an upper edge of said composite end wall to maintain said inner end flaps in said elevated position.
 6. The container of claim 3, wherein at least a portion of said at least one connecting strip is formed from said inner end flap.
 7. The container of claim 3, wherein said at least one connecting strip includes at least one fold line.
 8. The container of claim 1, wherein said inner end flap is secured to a detachable portion of said composite end wall, wherein said detachable portion is detachable from said composite end wall so that said inner end flap is detachable from said composite end wall.
 9. A blank for forming the container of claim
 1. 10. A carton for enclosing articles, the carton being expandable to contain a heat transfer agent, comprising: a pair of side walls; a top wall having a pair of partially detachable retention panels defined therein, each of said partially detachable retention panels being hingedly connected to a respective one of said pair of side walls; a pair of composite end walls, each of the composite end walls comprising a detachable top end flap that is connected to both of the side walls by a pair of connecting strips and that is detachably connected to both the partially detachable retention panels; wherein the partially detachable retention panels are foldable to a generally upright position with respect to the side walls, and the connecting strips slidably connect the top end flaps to the side walls such that the top end flaps are slidable with respect to the composite end walls after the top end flaps are detached from the partially detachable retention panels.
 11. The carton of claim 10, wherein each of the connecting strips is formed at least in part from a respective one of the top end flaps, and is hingedly connected to a respective one of the side walls.
 12. The carton of claim 11, wherein said each connecting strip is further formed at least in part from the top wall.
 13. The carton of claim 10, wherein the distal edges of the partially detachable retention panels are defined by at least one severance line, and the side edges of the partially detachable retention panels are defined by severance lines each extending along a hinged connection between a respective one of the top end flaps and the top wall.
 14. The carton of claim 10, wherein: each composite end wall further comprises a bottom end flap; and each top end flap is detachable with respect to the remainder of the composite end wall by means of a pull tab that is secured in a face contacting arrangement with a detachable reinforcing tab of a respective one of the bottom end flaps, said pull tab of said each top end flap being accessible for breaking a severance line that connects the detachable reinforcing tab to said respective bottom end flap.
 15. The carton of claim 10, wherein each top end flap further comprises a locking tab formed therein for locking the each top end flap in a elevated position by engaging a distal edge of the composite end wall.
 16. The carton of claim 10, further comprising: a bottom wall opposing said top wall and hingedly connected to said side walls and to said composite end walls; and web panels hingedly connecting adjacent ones of the side walls and the end walls at the bottom wall, the web panels being for preventing leakage of liquid from the carton.
 17. A blank for forming the carton of claim
 10. 18. A blank for forming a carton for enclosing articles, the carton being reconfigurable to expand a volumetric capacity of the carton, the blank comprising: a top panel; a pair of side panels each for being hingedly connected to opposing sides of the top panel along a fold line; a pair of slidable end flaps each hingedly connected to opposing ends of the top panel along a severable connection; a pair of partially detachable retention panels defined in the top panel, each of said partially detachable retention panels being defined at least in part by a severance line extending along the length of the top panel, by the fold lines, and by each severable connection; a plurality of connecting strips for connecting each of the slidable end flaps to side panels, each connecting strip being partially detachable from a respective one of said slidable end flaps and defined at least in part by a hinged connection between the each connecting strip and the respective slidable end flap.
 19. The blank of claim 18, further comprising: a bottom panel for being hingedly connected to each of said side panels; a pair of bottom end flaps hingedly connected to opposing ends of the bottom panel; a pull tab formed in each of a pair of slidable end flaps; and a detachable reinforcing tab formed in each of the bottom end flaps; wherein the pull tabs are positioned to come into registry with and be secured to the detachable reinforcing tabs respectively in the erected carton.
 20. The blank of claim 19, further comprising web panels hingedly connected to each of the bottom end flaps and extending to a respective one of side end flaps that are hingedly connected to said side panels respectively. 